Philadelphia Weather Outlook

THIS WEEK’S WEATHER

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Friday and the Weekend

Posted Thursday 08/28/25 @ 5:09 PM — The clouds came in today as forecast yesterday. I could be wrong, but I didn’t hear much about this cloudiness last night from the TV/radio weather folks.

The forecast for Friday is looking better. Little in the way of clouds and the chance of a shower late afternoon is very low.

The weekend weather looks quite spectacular! Enjoy!

12z GDPS with “AI Spectral Nudging” forecast for Monday at 2 PM. High pressure over the northeastern US. (Click on image for a larger view.)
Thursday Friday Outlook

Posted Wednesday 08/27/25 @ 5:27 PM — High pressure moves off to the east. A return southwesterly flow of somewhat moister air moves in aloft bringing some mid-level cloudiness mid morning Thursday until about 3 or 4 PM Thursday afternoon.

A cold front moves through Friday morning. The upper air dynamics are well well north of our region. With little moisture, we may get some clouds, but even that looks to be negligible. Wind shift back to the west northwest to continue our spectacular weather.

A few instability showers may develop late afternoon; most areas will see no rainfall.

12z RRFS forecast for Friday 7 PM. (Clouds-black grey) The cold front brings little in the way of rain to our area. (Click on image for a larger view.)
Tuesday Update
Wed 5:00 PM —Forecast Review — As a followup to yesterday’s informal test of the RRFS, isolated showers did break out and made it into western Chester, Montgomery and Bucks counties before dissipating.
Yesterday’s Radar loop courtesy of WeatherTap.com. A reasonable likeness to the 12 RRFS forecast. A later (18z) RRFS forecast was spot-on. (Click on image for a larger view.)

Posted Tuesday 08/26/25 @ 4:17 PM — Not much happening weather-wise this week. But another quick test presents itself this evening for the RRFS experimental model . The RRFS shows a potent short wave moving through our area with enough moisture and vertical lift to cause a few very widely scattered showers Tuesday evening, about 9 PM.

12z RRFS model Relative Humidity at 10,000 feet (maroon shading) and areas of strong vertical motion (multicolor shading). (Click on image for a larger view.)

Just curious to see if it happens.

FYI, a similar setup about 7-8PM up in New York for the Phillies. Too widely scattered to likely affect the game.

Originally Posted Mon 9:57 AM —What appears to be a changed weather pattern has taken hold with an upper level trough in the eastern US with surface level high pressure. A mostly dry and cooler pattern will result.

06z ECMWF-AI forecast for Thursday at 8 AM. High pressure over our area. A cold front near the Great Lakes may bring light showers later Friday, but a mostly dry and cool pattern overall. (Click on image for a larger view.)

Quiet weather for the next week or so! Enjoy!